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This post share my experience on the error of Unexpected namespace prefix "xmlns" found for tag fragment on xmlns:map="http://schemas.android.com/apk/res-auto".Recently, I re-check my old project using Google Maps Android API v2, it work without error before. But LogCat show error:
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E/AndroidRuntime(20411): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.google.android.gms.maps.MapFragment: make sure class name exists, is public, and has an empty constructor that is public
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E/AndroidRuntime(20411): Caused by: java.lang.ClassNotFoundException: com.google.android.gms.maps.MapFragment
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Then I re-visit the layout xml with MapFragment, error message show Unexpected namespace prefix "xmlns" found for tag fragment on the statement xmlns:map="http://schemas.android.com/apk/res-auto".
To solve it, correct Java Build Path by right clicking on your project -> Java Build Path, select Order and Export tab, check both Android 4.2.2 and Android Private Libraries, and click OK.
And then clean and build the project.
Similar to the case: java.lang.RuntimeException: Unable to instantiate activity ComponentInfo
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